CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (310,557)	$ 70,589	$ 224,785
Other comprehensive income (loss):
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(72)	(141)	82
Total other comprehensive income (loss), net of tax	(72)	(141)	82
Comprehensive income (loss)	$ (310,629)	$ 70,448	$ 224,867